Efficient use of quantum resources for the transmission of a reference frame

Details Efficient use of quantum resources for the transmission of a reference frame Efficient use of quantum resources for the transmission of a reference frame

2004-05-17

arxiv.org/abs/quant-ph/0405095v2

Phys. Rev. Lett 93, 180503 (2004)

Physics

Quantum Physics

4 pages, no figures; added new references and improved introduction. Accepted for publication on PRL

Scientific paper

10.1103/PhysRevLett.93.180503

We propose a covariant protocol for transmitting reference frames encoded on
$N$ spins, achieving sensitivity $N^{-2}$ without the need of a pre-established
reference frame and without using entanglement between sender and receiver. The
protocol exploits the use of equivalent representations, which were overlooked
in the previous literature.

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